Magneto-electric igniter device for explosive-engines.



PATENTBD FEB. 11, 1908. 0. GARLBORG. MAGNETO ELECTRIC IGNITBR DEVICE FOR EXPLOSIVB ENGINES.

APPLICATION FILED MAR. 11, 1907.

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UNITED STATES PATENT OFFICE.

OTTO CARLBORG, OF PROVIDENCE, RHODE ISLAND.

Specification of Letters Patent.

Patented Feb. 1 1, 1908.

Application filed March 11. 1907. Serial No. 361.686.

' To all whom it may concern:

Be it known that I, OrTo CARLBORG, a citizen of the United States of America, and

a resident of Providence, in the county of 5 Providence and State of Rhode Island, have invented certain new and useful Improvements in Magneto-Electric Igniter Devices for Explosive-Engines, of which the following is a specification.

My invention relates to ma note-electric igniters for explosive-engines, t e device being of the general type or class in which the armatures of the magnetos employed have an intermittent or osc1 latory movement.

The object I have in view is to provide a magneto of the class referred to with improved simple and comparatively inexpensive means for positively oscillating the armature in a uniform manner in both directions.

By means of my invention, which includes a continuously revoluble novel track-cam, a much quicker and more uniform angular movement of the armature is attained; the.

strength of the current roduced by and duringeach movement of t e armature in either direction is substantially invariablegthe armature driven mechanism and saidcam may be rotated at a reduced rate of speed, while at the same time increasing that of the armature; the latter may be oscillated a number of times, say four, and in a positive manner,- per revolution of its actuating means; a (ipicker action is imparted to the armature, t e same being effected by a short angular movement of the driving-gear or cam; no springs whatever are employed; it is practically noiseless and the degree of working friction is greatly reduced; and the cam may be driven by any shaft or other'suitable means arranged to break the magnetic field at the proper time, or, in other words the construction is such that a high armature speed is attained with a much slower rotary cam movement. I g In the accompanying sheet of drawin s, Figure 1 represents a front end elevation o a magneto embodying my improvement. Fig. 2 represents a corresponding side elevation. Fig. 3 1s a corresponding top plan view. Fig. 4 is an end elevation, 1n partial section, the driving-gear being omitted so as to show the relative arrarigement of the armature, fieldieces, etc.

bro an away, showing the cam-path and the ig, 5 is a front elevation, in en- 65 .a1' ed scale, a portion of the cam being 1 relation of the armature-crank thereto. Fig. 6 represents a rear view of the cam itself, and Fig. 7 is a vertical sectional view, taken on line w as of Fig. 6 showing the manner of constructing the cam.

The following is a more detailed descrip tion of my invention, and including the correlated parts or elements.

The magneto as a whole is designated A in the drawings. I would state here that the usual non-magnetic base a, the several permanent magnets b, the oppositely disposed fixed pole-pieces or field-magnets f, the armature B, its shaft 0 and the rear conductor member 1a, insulated at m from which the generated current flows via the wire t to a suitable timing device, are or may be constructed and arranged in any well-known manner, and I therefore make no specific claim to said parts herewith.

My invention resides, essentially, in the operatively connected with and adapted'in its movements to intermittingly oscillate the armature in a positive manner. To the front end of the armature shaft 0 is secured a short crank d having a pin 61 carrying a roll 1' adapted to the groove of the said cam, about to be described.

As drawn, the cam O is revoluble on a stud a fixed in a front extension a of the said base member (tithe location of the stud with respect to the armature shaft being such that the major and minor radii of the path D of the cam positively determine or limit the degree of vibration or angular movements of the armature. form, itshub being bored to turn freely on the fixed stud orsupport and to be drivenby a gear 9, or other analogous device, secured thereto, as clearly indicated in the drawings.

may be made of cast iron, and having a rearwardly extending peripheral rim n integral therewith. The said cam-groove proper,D,

of cutting away the stock to form the groove the latter may be produced, as re" resented in the drawings, by-a plurality o suitably shaped thin flat plates a of non-metallic material, as for example fibroid, alternating with similarly shaped thin fiat sheets or plates 1: of metal, as brass or steel. 7. The several pieces of sheet stock are superposed in and practically fill the annular space formed between the IlIll and hub pornovel revoluble disk-like cam member C The said cam has a disk-like The casing or body portion n of the cam is formed in the rear face of the cam. In lieu See Fig.

tions of the cam and are removably secured in position by suitably disposed screws 8 passing transversely through the members n, u and v and tapped into correspondingly shaped laterally movable. metal fasteningplates h it. As thus constructed the plates to and v interposed between-the casing part it and the said backing members are all adapted to be rigidly clamped together.

In'Figs. 5 and'6 the continuous groove or path D of the cam isrepresented as being divided into four curved idle sections, the length of each are being about 90 The two outer sections, e e, are oppositely disposed and are described from the cams center by the longer radius, the other two sections,

a e are also 0 positely arranged with respect to each ot er and are located at right disposed in a circle concentric with the rstnamed sections, and

being described by the shorter radius, all the sections being in one common plane. The i adj acentends of each of the sections e and e terminate in a straight section, 6 each of the 'trically connected (in any well-known man-.

ground? conductor it connected with-the latter when in use constituting the operative portion of the cam, its angular le th being about one-fifteenth of the cams clrcumference, as indicated at-z in Fig. 6. 'It will'be seen that the two sections '8 on each side of the cam are or may be in alinement and also parallel with the corresponding section, e on the opposite half of t e cam.

Any suitable means may be employed for driving the improved magneto A. In the 'drawin a shaft s carrying a gear g is adapte to -be rotated in any well-known manner relatively to the speed of the engine, thereby positively rotating the gear 9, meshing. with gear 9, and. the cam O secured thereto.

Now assuming the magneto A to be elecner, or as indicatedin Fig. 3) by a conductor t leading from the armature-shaft to a suitable timmg device T, the latter in turn being connected tothe spark-glugs of the cylinders of an engine E, and aving a return or engine and magneto, all arranged and adapted for operationsubstantially as usual;

and iurtherassuming the cam'O of the magneto to be continuously revolving inthe arrow-direction at the desired speed, .the armature B and its crank d atthe instant then being sationary and in the position represented say in Fig. 5, the manner of operation of the cam, &c-., may be described as follows: The short angular ,movement (z,' Fig. 6) of the cam, being the'length of each worhng section e will in 006 oration with,

the crank-pin and roll niounte m the camgroove quickly vibrate the crank ahead or toward the right to the central dotted line position (1?, indicated in Fig; 5, thereby correspondingly rotating the armature breaking the magnetic-circuit between the poles, the resulting action bein utilized, in

cooperation with the means indicated in Fig. 3, to produce an electric spark for ignit- I ing-the charge of gas in the cylinder bf the engine. I The armature remains idle or-stav tionary while the roll guided in the cor-- volving through the succeeding inner concentric arc section a and until" the next work The armature now rema ns ldle while the cam 1s re-' ing section, e is reached; the angularmovement 2 of the cam theninstantly swings the crank ahead again back to the right as before described, thereby again breaking the magnetic circuit, the armature meanwhile remaining idle while the cam moves through the succeeding outer section euntil the roll engages the next working section, the move mcnt 2, as before stated, then swinging the crank to the left to again break the circuit;

The armature and its connected'parts now' remain stationary or idle duringwthe cams movement through the next inner concentric arc section. (2 until the base of the, suc-- ceeding section e is en aged by the rollcarrying pin of the cran member d, thus completing one revolution of the cam, the

relation of the parts then appearing as represented in Fig. '5, The operation just described is continuously repeated while the engine remains in action.

It will be apparent that the action of the continuously revoluble cam causes the armature to be swung quickly and positively on its axis four times and at regular intervals during each revolution of the cam, the armature being idle or stationary during the remainder of the cams said movement. By means of my improved construction and ar rangement the'magneto-electric current may be generated and utilized with greater efliciency; the driving-- ear mechanism may be rotated. at a reduced rate of speed while at the same time materially increasing the loo speed ofthe intermittingly movable armawith respect thereto, of a continuously revor'inspection, lubrioluble driving member having a. continuous crun-slmped groove or path, and acrank secured to the armature and cooperating with said grooved member for imparting a plurality of intermittent oscillatory movements to the armature to produce a corresponding number of ignition spar is during each revolution of the driving member.

2. In a magneto device of the character described, the combination with the movable armature thereof and a crank member 50-} cured thereto, of a continuously 'revoluble 5 driving disk having a plurality of evenly spaced divisions or members adapted to be opera-tively engaged by said crank in a successive manner, constructed and arrang'ed so that when in usetbe armature i brated quickly and intermittingly a short l angular distance a corresponding number of 1 times during each revolution of mud disk; tionary position immediately succeeding i each vibratory movement. 7 H l Signed at Providence, R. 1., this 7th (lo/y *1 of March, 1907. I

o'rro wiuinnoiui'.

l Vitnesses 'Gno. H. REMrNo'roN, i (ALVIN H. BROWN;

will be vi 7 the armature remaining ii -en idle or stat; 

